/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassExecutionContext.h
Processes SubsystemRequirements to fetch and cache all the indicated subsystems. If aUWorldis required to fetch a specific subsystem then the one associated with the stored EntityManager will be used.true_ if all required subsystems have been found,false_ otherwise.
bool CacheSubsystemRequirements ( const [FMassSubsystemRequirements](API\Plugins\MassEntity\FMassSubsystemRequirements) & SubsystemRequirements )